Rosa Parks was born in 1913 in Alabama. She attended segregated schools and worked for the NAACP. In 1955, she refused to give up her seat to a white passenger on a bus, which led to her arrest. Her arrest sparked the Montgomery Bus Boycott, a 381-day boycott of the bus system organized by Martin Luther King Jr. that challenged racial segregation in public transit. The boycott contributed to a Supreme Court ruling that declared Alabama's bus segregation laws unconstitutional.